Testing-yoke for safety-valves



(No Model.) I

' J. E. LONERGAN.

TESTING YKE FOR SAFETY VALVES.

No. 455,001. Patented June 30,1891.

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UNITI-:D STATI-3s 4PATENT GPFICE.

.IoHN E. LONERGAN, or PHILADELPHIA, PENNSYLVANIA.-

TESTIING-YOKE FOR SAFETY-VALVES.

SPECIFICATION forming part of Letters Patent No. 455,001, dated J une30, 1891. l Application filed March 24, 1891. Serial No. 386,223. (Nomodel.)

To all wtort t may concern:

Be it known that I, JOHN E. LONERGAN, a citizen of the United States,and a resident of Philadelphia,Pennsylvania, have invented a new andImproved Testing-Yoke for Safety- Valves; and I hereby declare thefollowing to be a description thereof, reference being had to theannexed drawings, making part hereof.

My device is designed as a temporary attachment to safety-valves duringthe operation of testing/the boilers upon which the valves `are set, andparticularly with such valves as are provided with springs of a strengthadapted to be compressed to open the valve at a desired pressure.Boilers are generally tested at a pressure about one-third to one-halfabove their working-pressure. Thus, if the working pressure is eightypounds, the boiler will be tested at about one hundred and twentypounds. If the spring in the valve is of a strength adapted to becompressed sufficiently to open the valve at a pressure of eightypounds, such an excessive pressure as one hundred and twenty poundswould strain it and render it unreliable in future use. I desire toovercomethis difficulty, and the nature of my invention will appear fromthe following specification and claims.

In the drawings, Figure l is a vertical sectional view of a safety-valvewith my yoke attached; Fig. 2, an elevation of a similar valve with itsordinary lever to be weighted; Fig. 3, a perspective View of the pivotedlink; Fig. 4:, the serrated or notched bar. Fig. 5 is a ring-ended rod.

A is the shell of the valve; B, an innercontained valve by the raisingof which steam escapes to space C and through exit O; D, the spring; E,the stem, which is attached in the usual way to weighted lever E theweight not being shown; F, a collar or rest for spring D near the lowerend of said stem. A fixed plug Gis provided with a collar G',surrounding stem E, against the lower face of which collar the spring Dsets. Stem. E sets down into valve B, holding the latter to its seatuntil the pressure in the boiler is sufficient to compress spring D andraise lever E.

H is a link pivoted at H', through its lug I, to the standard J, whichlatter projects upward from the valve-shellA; K, a rod screwthreaded atits lower end to engage ina female screw-thread in a block in the top ofthe kvalve-shell and provided with an open collar K at its upper end.

L is a bar or rack provided with serrations' or notches L. It isex'ilarged at its middle and pierced with a screw-threaded hole L.

M is a screw-threaded rod or bolt adapted to engage in hole L" andprovided with a polygonal head N. The upper inner faces of link H andcollar K are each beveled to an edge O, so as readily to engage innotches L. The lower end of rod M is slightly concave, and the upper endof stemE correspondingly convex, so that they will engage one with theother.

The operation is as follows: Suppose the springD to be of a strengthadapted to be compressed only when a pressure exceedlng eighty pounds isreached in the boiler, and that itis to be tested ata pressure of sayone hundred and twenty pounds. Thelever E', with the nut on the top ofthe stem, is first removed, and the rod K is screwed into the block orthickened portion on the shell A, (see Fig. 1,) and the link H ispivoted at H by a pin. The bar Lis then passed through the openings inlink H and collar K', with its serrated edge uppermost, its engagementwith collar K being such or so adj usted as to bring hole L directlyover the top of stem E. The rod M is then inserted and screwed down uponthe top of stem E. The barLbeing thus set up against the beveled edges OO, the rod N is screwed down upon the stem until the Valve B is driventightly against and held rigidly to its seat, thusthrowing thesafety-valve apparatus out of service. The boiler-test can then be made,using the steampressure gage as the -indicator, and when it is over theoperation above described can be reversed and the safety-valve apparatusagain thrown into action.

It will be seen that bar L can be used to lock valves of various sizes,and the bar beingr constructed for use with the largest-sized valves canbe used for "smaller ones. The link H, being pivoted, will act atvarious slanted positions outof the perpendicular as a bearing for bar Lin adjusting the latter in IOO collar K to bring hole L over the top ofstern E. Practically both parts Il and K are collars.

l. A yoke for safety-valves, consisting of rigid rod K, provided with acollar K', link H, pivoted to the safety-Valve, transverse serrated barL, provided with screw-threaded opening L", and screw threaded rod M,adapted to engage with said bar L through its opening L and to set belowagainst the top of the stern of the safety-valve, substantially as andfor the purposes described.

2. A yoke for safety-valves, consisting of rigid rod K, links H, securedto a stationary obj ect and adapted to permit lateral motion of bar L asit is adjusted in collar K', bar L, provided with a Screw-threadedopening L and adapted to engage rigidly with said rod K, and screw-thread ed rod M, adapted to engage with said bar L through its opening Land to set below against thetop of the stem of the safety-valve.

3. A yoke for safety-valves, consisting of rigid rod K, secured or setin the shell of the valve and provided with a collar K', link Il,pivoted to the saety-valve, transverse serrated bar L, provided withscrew-threaded GEORGE E. BUCKLEY, HENRY V. BUCKLEY.

